incorrect position?

[Kwinki]

What does this mean...? I had 12 tanks trying to destroy 2 enemy tanks, but got the ''incorrect position'' sign and they were not firing on my enemy and I lost because of that :|

Probably a stupid question, but I feel im missing something

[ŊЏ | Shifu]

Which units exactly did you have? Also, did it only occur one time? If there's a selection problem, just hit escape twice and it should work again.